EST から GMT 変換 Convert Eastern Time (EST/EDT) back to Greenwich Mean Time (GMT/UTC) instantly. Perfect for East Coast professionals, researchers, and event organizers contacting GMT regions.
Reverse timezone calculator
米国東部標準時ESTをGMT（グリニッジ標準時）へリアルタイム変換。見やすい24時間換算表と正確なライブ時計で5時間の時差を確認。夏時間対応、登録不要で無料。
Understand the standard business crossover hours when converting from Eastern Time back to GMT.
| Eastern Time (EST/EDT) | Corresponding GMT | Scheduling Practicality |
|---|---|---|
| 9:00 AM Eastern | 2:00 PM / 1:00 PM GMT | Perfect morning synchronization. |
| 12:00 PM Eastern | 5:00 PM / 4:00 PM GMT | End of GMT business day alignment. |
| 2:00 PM Eastern | 7:00 PM / 6:00 PM GMT | Out of office hours for GMT. |
Comprehensive hourly breakdown across all 24 hours of the day showing both EST and EDT offsets.
| Eastern Time | GMT (Winter / EST) | GMT (Summer / EDT) | Date Status |
|---|---|---|---|
| 12:00 AM EST/EDT | 05:00 AM GMT | 04:00 AM GMT | Same day |
| 01:00 AM EST/EDT | 06:00 AM GMT | 05:00 AM GMT | Same day |
| 02:00 AM EST/EDT | 07:00 AM GMT | 06:00 AM GMT | Same day |
| 03:00 AM EST/EDT | 08:00 AM GMT | 07:00 AM GMT | Same day |
| 04:00 AM EST/EDT | 09:00 AM GMT | 08:00 AM GMT | Same day |
| 05:00 AM EST/EDT | 10:00 AM GMT | 09:00 AM GMT | Same day |
| 06:00 AM EST/EDT | 11:00 AM GMT | 10:00 AM GMT | Same day |
| 07:00 AM EST/EDT | 12:00 PM GMT | 11:00 AM GMT | Same day |
| 08:00 AM EST/EDT | 01:00 PM GMT | 12:00 PM GMT | Same day |
| 09:00 AM EST/EDT | 02:00 PM GMT | 01:00 PM GMT | Same day |
| 10:00 AM EST/EDT | 03:00 PM GMT | 02:00 PM GMT | Same day |
| 11:00 AM EST/EDT | 04:00 PM GMT | 03:00 PM GMT | Same day |
| 12:00 PM EST/EDT | 05:00 PM GMT | 04:00 PM GMT | Same day |
| 01:00 PM EST/EDT | 06:00 PM GMT | 05:00 PM GMT | Same day |
| 02:00 PM EST/EDT | 07:00 PM GMT | 06:00 PM GMT | Same day |
| 03:00 PM EST/EDT | 08:00 PM GMT | 07:00 PM GMT | Same day |
| 04:00 PM EST/EDT | 09:00 PM GMT | 08:00 PM GMT | Same day |
| 05:00 PM EST/EDT | 10:00 PM GMT | 09:00 PM GMT | Same day |
| 06:00 PM EST/EDT | 11:00 PM GMT | 10:00 PM GMT | Same day |
| 07:00 PM EST/EDT | 12:00 AM GMT (next day) | 11:00 PM GMT | Next day in EST |
| 08:00 PM EST/EDT | 01:00 AM GMT (next day) | 12:00 AM GMT (next day) | Next day (+1) |
| 09:00 PM EST/EDT | 02:00 AM GMT (next day) | 01:00 AM GMT (next day) | Next day (+1) |
| 10:00 PM EST/EDT | 03:00 AM GMT (next day) | 02:00 AM GMT (next day) | Next day (+1) |
| 11:00 PM EST/EDT | 04:00 AM GMT (next day) | 03:00 AM GMT (next day) | Next day (+1) |
When converting from Eastern Time to GMT, you must add hours rather than subtract them. Specifically, if Eastern Time is in standard time (EST), you add 5 hours to find GMT. If Eastern Time is in daylight saving time (EDT), you add 4 hours. For example, 9:00 AM EST is 2:00 PM GMT, and 9:00 AM EDT is 1:00 PM GMT.
Convert local Eastern incident logs to standard UTC/GMT reference times.
Coordinate webinar starts for a European audience from the US East Coast.
Align flight departures and transport tickets using standardized GMT offsets.
Since Eastern Time is behind GMT, you must add hours (5 in winter, 4 in summer) to convert Eastern to GMT.
Do not assume Eastern Time is always UTC-5. In summer, EDT is UTC-4, altering the calculation.
Use GMT/UTC when saving log data, then render Eastern Time locally for users.
Add 5 hours to EST (winter) or 4 hours to EDT (summer) to obtain the matching GMT time.
Yes. Eastern Time is behind GMT, meaning GMT is further ahead in the day.
Forgetting that Eastern Time observes daylight saving time (EDT) in summer, leading to a 1-hour schedule mismatch.
GMT/UTC is the standard for databases and logs, which ensures consistent sorting regardless of local user locations.
Converting EST/EDT back to GMT is simple when you remember to add the active offset. Keep this page bookmarked for fast calculations.
Next Step: Convert Eastern Time to GMT using the reverse calculator above.
